MOSCOW (AP) — Russian troops have begun pulling back to their permanent bases after a massive buildup that caused Ukrainian and Western concerns. On Thursday, Russian Defense Minister Sergei Shoigu declared the sweeping maneuvers in Crimea and wide swaths of western Russia over, and ordered the military to pull the troops that took part in them back to their permanent bases by May 1. The concentration of Russian troops amid increasing violations of a cease-fire in the conflict in eastern Ukraine raised concerns in the West, which urged the Kremlin to pull its forces back.